25 April 2008 Improvement of photopolymer materials for holographic data storage
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Abstract
The one-dimensional diffusion equation, which governs the temporal evolution of holographic grating formation in photopolymers, which includes the non-local material response, the generalized dependence of the rate of polymerization on the absorbed illuminating intensity and the inclusion of our material's response to initiation and inhibition effects has been previously studied and presented. The resulting analytic expressions for the monomer and polymer concentrations have been derived and their validity tested against experimental data using a four-harmonic, numerical fitting regime. In this paper we examine the spatial frequency response of our photopolymer material and using our improved NPDD model we fit experimentally obtained data and extract estimates for material parameters. We attempt to improve our material's spatial frequency response with the addition of chain transfer agents to reduce the polymer chain length formed and the non-local chain-length variance. Achieving this should increase the locality of the polymer chains and hence cause an improvement in the spatial frequency response of the material. It is a material's response to high spatial frequencies, which determines a material's resolution and data storage density.
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Michael R. Gleeson, Michael R. Gleeson, Shui Liu, Shui Liu, Ciara E. Close, Ciara E. Close, Dusan Sabol, Dusan Sabol, John T. Sheridan, John T. Sheridan, } "Improvement of photopolymer materials for holographic data storage", Proc. SPIE 6994, Photon Management III, 69940P (25 April 2008); doi: 10.1117/12.781650; https://doi.org/10.1117/12.781650
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